will this night change an election that's just a month away? >> i need your help on november 6th. >> you believe in me. i'm asking for your vote. >> the nation is watching, voters want answers and america's future is up for debate. >>> this is university of denver, where the presidential candidates could go a long way tonight toward winning or losing the white house. president barack obama and governor mitt romney, they are both getting ready to take the stage and compete face to face for the first time in this campaign. we want to welcome our viewers in the united states and around the world to debate night in america. i'm wolf blitzer. there's enormous pressure on president obama and governor romney right now. the biggest challenges facing the country are on the line as well as the outcome of this election. even the candidates' wives are feeling the stress. we have cnn exclusives tonight. brand new interviews with michelle obama and ann romney. the first lady shared her debate anxiety with our jessica yellin. >> i get so nervous at these deba